How are you lighting it?
Lighting is CRUCIAL to any kind of photography, but with something like a computer that is (usually) a reflective surface, even more important.
Try bouncing your light source off a reflector - doesn't have to be anything special, but something to diffuse the light so that you avoid 'hot spots'.
Chances are, unless light is plentiful, that you're going to need a tripod.
Also, think about your background - make sure that unless going for a particular effect, you use something neutral.
Lastly, consider a shallow depth of field - this will give interest to the foreground, and remove the background so you don't end up with something distracting.
Cheers,
James